Various methods for the calculation of boiler control system have been contrived by many investiga-tors.
We developed the theoretical expression for the dynamic characteristics of steam temperature control system of boiler and derived some approximate transfer functions.
In this article, it is shown that our method, considered the mutual interference in steam, pipe and combustion gas, have been experimentally confirmed in the test of dynamic characteristics of 520 T/H boiler.
This expression for the dynamic characteristics may be useful to the design of steam temperature control system of boiler and to the study of performance when the load of boiler is changed.